A   B   C   D   E   F   G   H   I   J   K   L   M   N   O   P   Q   R   S   T   U   V   W   X   Y   Z  

Mokhov, N. V.

Paper Title Page
MOPAS027 Energy Deposition Studies of Block-Coil Quadrupoles for the LHC Luminosity Upgrade 491
  • N. V. Mokhov, V. Kashikhin, M. Monville
    Fermilab, Batavia, Illinois
  • P. Ferracin, G. L. Sabbi
    LBNL, Berkeley, California
  Funding: Work supported by the Director, Office of Science, U. S. Department of Energy under Contract DE-AC02-05CH11231.

At the LHC upgrade luminosity of 1035 cm-2 s-1, collision product power in excess of a kW is deposited in the inner triplet quadrupoles. The quadrupole field sweeps secondary particles from pp-collisions into the superconducting coils, concentrating the power deposition at the magnetic mid-planes. The local peak power density can substantially exceed the conductor quench limits and reduce component lifetime. Under these conditions, block-coil geometries may result in overall improved performance by removing the superconductor from the magnetic mid-planes and/or allowing increased shielding at such locations. First realistic energy deposition simulations are performed for an interaction region based on block-coil quadrupoles with parameters suitable for the LHC upgrade. Results are presented on 3-D distributions of power density and accumulated dose in the inner triplet components as well as on dynamic heat loads on the cryogenic system. Optimization studies are performed on configuration and parameters of the beam pipe, cold bore and cooling channels. The feasibility of the proposed design is discussed.

TUPAS011 Collimation System for the Fermilab Booster to Main Injector Transfer Line 1673
  • B. C. Brown, D. Capista, I. Kourbanis, N. V. Mokhov, V. Sidorov
    Fermilab, Batavia, Illinois
  Funding: Work supported by the U. S. Department of Energy under Contract No. DE-AC02-76CH03000.

A collimation system has been created for removing proton beam halo in the 8 GeV transfer line from the Fermilab Booster to Main Injector. A pair of 1.14 meter collimators with 5.08 cm rectangular apertures are installed in a 5 meter straight section. Horizontal and vertical motion systems allow them to be positioned such that halo can be scraped from four sides. An additional pair of collimators, placed one cell (90 degrees) downstream scrape halo which is of opposite phase. Each collimator pair can scrape about 600 Watts of beam power, limited by long term activation of materials outside of the beam line tunnel. Personnel exposure is reduced by surrounding the iron absorber with a layer of marble. Design features,radiation calculations and instrumentation considerations will be described.

TUPAS016 Collimation System Design for Beam Loss Localization with Slipstacking Injection in the Fermilab Main Injector 1688
  • A. I. Drozhdin, B. C. Brown, D. E. Johnson, I. Kourbanis, N. V. Mokhov, I. Rakhno, V. Sidorov
    Fermilab, Batavia, Illinois
  • K. Koba
    KEK, Ibaraki
  Results of modeling with the STRUCT and MARS15 codes of beam loss localization and related radiation effects are presented for the slipstacking injection to the Fermilab Main Injector. Simulations of proton beam loss are done using multi-turn tracking with realistic accelerator apertures, nonlinear fields in the accelerator magnets and time function of the RF manipulations to explain the results of beam loss measurements. The collimation system consists of one primary and four secondary collimators. It intercepts a beam power of 1.6 kW at a total scraping rate of 5%, with a beam loss rate in the ring outside the collimation region of 1 W/m or less. Based on thorough energy deposition and radiation modeling, a corresponding collimator design was developed that satisfies all the radiation and engineering constraints.  
THPMN089 Enhancement of Heat Removal using Concave Liquid Metal Targets for High-Power Accelerators 2915
  • I. Konkashbaev, P. F. Fisher, A. Hassanein
    ANL, Argonne, Illinois
  • N. V. Mokhov
    Fermilab, Batavia, Illinois
  The need is increasing for development of high power targets and beam dump areas for the production of intense beams of secondary particles (IFMIF, SNS, RIA, LHC). The severe constraints arising from a MW beam power deposited on targets and absorbers, call for non-trivial procedures to dilute the beam. This study describes the development of targets and absorbers and the advantages of using flowing liquid metal in concave channels first proposed by IFMIF to raise the liquid metal boiling point by increasing the pressure in liquid supported by a centrifugal force. Such flow with a back-wall is subject to the Taylor-Couette instability. The instability can play a positive role of increasing the heat transfer from the hottest region in the target/absorber to the back-wall cooled by water. At the laminar stage of the instability with a certain wave number of vortexes, the heat transfer from a chain of vortexes to the wall increases heat removal by enhancing the convective transport inside the liquid bulk and from the bulk to the wall. Results of theoretical analysis and numerical modeling of both targets and dump areas for the IFMIF, ILC, and RIA facilities are presented.  
THPMN098 Modeling and Design of the ILC Test Area Beam Absorbers at Fermilab 2939
  • M. Church, A. Z. Chen, N. V. Mokhov, S. Nagaitsev, N. Nakao
    Fermilab, Batavia, Illinois
  Detailed MARS15 simulations have been performed on energy deposition and shielding of the proposed ILC Test Area absorbers to deal with up to 50 kW of 800 MeV electron beam power and provide unlimited occupancy conditions in the hall. ANSYS analysis based on the calculated energy deposition maps confirms robustness of the proposed design of the absorbers and beam windows for normal operation and for various failure modes. A non-trivial shielding solution was found for the entire region housing the main and single-bunch absorbers.  
THPMN100 Suppression of Muon Backgrounds Generated in the ILC Beam Delivery System 2945
  • A. I. Drozhdin, N. V. Mokhov, N. Nakao, S. I. Striganov
    Fermilab, Batavia, Illinois
  • L. Keller
    SLAC, Menlo Park, California
  Particle fluxes generated from the interactions of beam halo with the collimators in the ILC Beam Delivery System (BDS) can exceed tolerable levels for the collider detectors and create hostile radiation environment in the interaction region. Thorough analysis of the BDS model, beam loss patterns, driving geometry factors and physics processes along with verification of the simulation codes were performed for the current ILC BDS layout with 250-GeV electron and positron beams crossing at 14 mrad with a push-pull detector option. Muon flux reduction by distributed toroids (doughnut-type spoilers) in comparison with magnetic iron walls filling the BDS tunnel are calculated and analysed in great detail. Shielding conditions which allow occupancy of the interaction region while the full power beam is on the linac tuneup dump are also studied.  
THPMN102 A Muon Beam for Cooling Experiments 2948
  • A. Jansson, V. Balbekov, D. R. Broemmelsiek, M. Hu, N. V. Mokhov, K. Yonehara
    Fermilab, Batavia, Illinois
  Funding: Work supported by the US Department of Energy

Within the framework of the Fermilab Muon Collider Task Force, the possibility of developing a dedicated muon test beam for cooling experiments has been investigated. Cooling experiments can be performed in a very low intensity muon beam by tracking single particles through the cooling device. With sufficient muon intensity and large enough cooling decrement, a cooling demonstration experiment may also be performed without resolving single particle trajectories, but rather by measuring the average size and position of the beam. This allows simpler, and thus cheaper, detectors and readout electronics to be used. This paper discusses muon production using 400MeV protons from the linac, decay channel and beamline design, as well as the instrumentation required for such an experiment, in particular as applied to testing the Helical Cooling Channel (HCC) proposed by Muons Inc.

MOPAS094 A High-Power Target Experiment at the CERN PS 646
  • H. G. Kirk
    BNL, Upton, Long Island, New York
  • J. R.J. Bennett
    STFC/RAL/ASTeC, Chilton, Didcot, Oxon
  • O. Caretta, P. Loveridge
    STFC/RAL, Chilton, Didcot, Oxon
  • A. J. Carroll, V. B. Graves, P. T. Spampinato
    ORNL, Oak Ridge, Tennessee
  • I. Efthymiopoulos, A. Fabich, F. Haug, J. Lettry, M. Palm
    CERN, Geneva
  • K. T. McDonald
    PU, Princeton, New Jersey
  • N. V. Mokhov, S. I. Striganov
    Fermilab, Batavia, Illinois
  We test a target concept of a free-flowing mercury stream embedded in a high-field solenoid. The goal is to demonstrate the copious production of secondary pions and tertiary muons in a megawatt class proton beam at the front end of a neutrino factory or muon collider. Key components are described and results of the experimental commissioning phase are given.  
WEOCAB01 Design of the Beam Delivery System for the International Linear Collider 1985
  • A. Seryi, J. A. Amann, R. Arnold, F. Asiri, K. L.F. Bane, P. Bellomo, E. Doyle, A. F. Fasso, L. Keller, J. Kim, K. Ko, Z. Li, T. W. Markiewicz, T. V.M. Maruyama, K. C. Moffeit, S. Molloy, Y. Nosochkov, N. Phinney, T. O. Raubenheimer, S. Seletskiy, S. Smith, C. M. Spencer, P. Tenenbaum, D. R. Walz, G. R. White, M. Woodley, M. Woods, L. Xiao
    SLAC, Menlo Park, California
  • I. V. Agapov, G. A. Blair, S. T. Boogert, J. Carter
    Royal Holloway, University of London, Surrey
  • M. Alabau, P. Bambade, J. Brossard, O. Dadoun
    LAL, Orsay
  • M. Anerella, A. K. Jain, A. Marone, B. Parker
    BNL, Upton, Long Island, New York
  • D. A.-K. Angal-Kalinin, C. D. Beard, J.-L. Fernandez-Hernando, P. Goudket, F. Jackson, J. K. Jones, A. Kalinin, P. A. McIntosh
    STFC/DL/ASTeC, Daresbury, Warrington, Cheshire
  • R. Appleby
    UMAN, Manchester
  • J. L. Baldy, D. Schulte
    CERN, Geneva
  • L. Bellantoni, A. I. Drozhdin, V. S. Kashikhin, V. Kuchler, T. Lackowski, N. V. Mokhov, N. Nakao, T. Peterson, M. C. Ross, S. I. Striganov, J. C. Tompkins, M. Wendt, X. Yang
    Fermilab, Batavia, Illinois
  • K. Buesser
    DESY, Hamburg
  • P. Burrows, G. B. Christian, C. I. Clarke, A. F. Hartin
    OXFORDphysics, Oxford, Oxon
  • G. Burt, A. C. Dexter
    Cockcroft Institute, Warrington, Cheshire
  • J. Carwardine, C. W. Saunders
    ANL, Argonne, Illinois
  • B. Constance, H. Dabiri Khah, C. Perry, C. Swinson
    JAI, Oxford
  • O. Delferriere, O. Napoly, J. Payet, D. Uriot
    CEA, Gif-sur-Yvette
  • C. J. Densham, R. J.S. Greenhalgh
    STFC/RAL, Chilton, Didcot, Oxon
  • A. Enomoto, S. Kuroda, T. Okugi, T. Sanami, Y. Suetsugu, T. Tauchi
    KEK, Ibaraki
  • A. Ferrari
    UU/ISV, Uppsala
  • J. Gronberg
    LLNL, Livermore, California
  • Y. Iwashita
    Kyoto ICR, Uji, Kyoto
  • W. Lohmann
    DESY Zeuthen, Zeuthen
  • L. Ma
    STFC/DL, Daresbury, Warrington, Cheshire
  • T. M. Mattison
    UBC, Vancouver, B. C.
  • T. S. Sanuki
    University of Tokyo, Tokyo
  • V. I. Telnov
    BINP SB RAS, Novosibirsk
  • E. T. Torrence
    University of Oregon, Eugene, Oregon
  • D. Warner
    Colorado University at Boulder, Boulder, Colorado
  • N. K. Watson
    Birmingham University, Birmingham
  • H. Y. Yamamoto
    Tohoku University, Sendai
  The beam delivery system for the linear collider focuses beams to nanometer sizes at the interaction point, collimates the beam halo to provide acceptable background in the detector and has a provision for state-of-the art beam instrumentation in order to reach the physics goals. The beam delivery system of the International Linear Collider has undergone several configuration changes recently. This paper describes the design details and status of the baseline configuration considered for the reference design.  
slides icon Slides